I need that this forward to support non-existing email accounts, so if someone send a wrong email address like mikez@domain.com while the real account is mike@domain.com, that the main mailbox account will recieve that kind of mails.

you can use the catchall account feature for this. put the catchall account as the main username, and this will make sure that all mails are delivered intact to the main user email. Not to mention that you are inviting spam here as well.